Destination guide
Kefalos weather by month
July, August and September are the best months for warm-weather holidays in Kefalos. July and August bring daytime averages of 26°C, while August has the warmest sea at 25°C. September is a good compromise if you prefer less heat, with days averaging 24°C and water still warm enough for comfortable swimming. Choose spring for gentler outdoor weather rather than warm seas; winter suits travellers who do not mind cool days and regular rain.
- Hottest month
- 26.5°CAugust
- Coolest month
- 13.4°CJanuary
- Warmest sea
- 24.9°CAugust
- Flight from London
- 4 h 6 minShort-haul (up to 4.5 h) · estimated
Kefalos, month by month
Month-by-month detail pages exist for our most searched destinations; for Kefalos the 12-month table below carries the full picture.
A little perspective
Kefalos through the year
Every month at a glance; "best" marks our three top months on warmth, dryness and sunshine.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 13.4°C | 10.9°C | 17.5°C | 5.0 | 103 | 11 | 0% |
| February | 13.5°C | 10.8°C | 16.8°C | 5.7 | 89 | 11 | 0% |
| March | 14.8°C | 12.0°C | 16.5°C | 7.1 | 53 | 7 | 0% |
| April | 16.9°C | 13.9°C | 17.0°C | 8.6 | 25 | 5 | 0% |
| May | 20.3°C | 17.2°C | 19.2°C | 10.6 | 11 | 2 | 3% |
| June | 23.9°C | 21.0°C | 22.0°C | 13.4 | 2 | 0 | 26% |
| Julybest | 25.9°C | 23.2°C | 23.4°C | 14.1 | 0 | 0 | 72% |
| Augustbest | 26.5°C | 23.9°C | 24.9°C | 13.2 | 0 | 0 | 85% |
| Septemberbest | 24.5°C | 21.9°C | 24.3°C | 11.2 | 8 | 1 | 38% |
| October | 21.6°C | 19.0°C | 22.7°C | 8.2 | 35 | 4 | 3% |
| November | 18.1°C | 15.4°C | 20.8°C | 6.0 | 70 | 8 | 0% |
| December | 15.0°C | 12.5°C | 18.9°C | 4.9 | 111 | 11 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
When to go to Kefalos
For beach weather, look at months where the daytime average clears 25°C and rainy days stay low: July, August. December is the wettest month (111 mm, about 11 rainy days) and July the driest (0 mm). The sea is warmest in August at 24.9°C and coolest in March at 16.5°C.
Getting there
A direct flight from London Gatwick to Kos International Airport "Ippokratis" (KGS, 13 km from Kéfalos) takes roughly 4 h 6 min - short-haul (up to 4.5 h) by UK standards. Time-zone: Europe/Athens.
Records and extremes, 1991-2020
The hottest day recorded in Kefalos between 1991 and 2020 reached 34.0°C on 30 June 2017; the coldest fell to 1.1°C on 14 February 2004. In August one day in ten tops 28.7°C and about 4% of days pass 30°C; in January one night in ten drops to 7.1°C or below. The wettest single month of the period was January 2004 with 234 mm, against a January average of 103 mm.
Sunrise, sunset and daylight in Kefalos
Local time on the 15th of each month; daylight-saving rules as of 2020.
| Month (15th) | Sunrise | Sunset | Daylight | Sunshine/day |
|---|---|---|---|---|
| January | 07:24 | 17:18 | 9.9 h | 5.0 h |
| February | 07:02 | 17:51 | 10.8 h | 5.7 h |
| March | 06:23 | 18:19 | 11.9 h | 7.1 h |
| April | 06:38 | 19:46 | 13.1 h | 8.6 h |
| May | 06:05 | 20:12 | 14.1 h | 10.6 h |
| June | 05:53 | 20:33 | 14.7 h | 13.4 h |
| July | 06:05 | 20:31 | 14.4 h | 14.1 h |
| August | 06:29 | 20:04 | 13.6 h | 13.2 h |
| September | 06:54 | 19:20 | 12.4 h | 11.2 h |
| October | 07:20 | 18:36 | 11.3 h | 8.2 h |
| November | 06:50 | 17:03 | 10.2 h | 6.0 h |
| December | 07:17 | 16:57 | 9.7 h | 4.9 h |
Winter and spring: cool starts, then a drier May
December, January and February are better for time outdoors between showers than for a swimming holiday. January is the coolest month, with days around 13°C, and each winter month averages 11 rainy days. Pack a waterproof and layers rather than relying on sunshine. March starts to dry out, but its 16°C sea is the coldest of the year, so brighter days do not yet mean inviting water. April brings 9 hours of sunshine and daytime averages of 17°C, useful for being outdoors without summer heat. May makes the clearest move towards holiday warmth: days reach 20°C and rain falls on just 2 days on average. Even then, the sea remains cool at 19°C, and a light evening layer is sensible.
Summer: the driest weather and warm evenings
June brings a useful balance if you want summer conditions without the highest temperatures: days average 24°C and the sea reaches 22°C. July and August are warmer, with daytime averages of 26°C, making shade and a break from the midday sun sensible. July has the most sunshine at 14 hours a day, while August offers the warmest swimming water at 25°C. All these summer months average 0 rainy days, so rain is unlikely to shape your plans, though that is not a guarantee. Evenings stay warm, especially in August when nights average 24°C; lightweight clothing is more useful than heavy layers.
Autumn: warm water lasts longer than the dry spell
September is the strongest autumn choice for a swimming holiday, combining 24°C days with a sea at the same temperature and just 1 rainy day on average. October remains mild at 22°C by day, and its 23°C sea is warmer than June's, making it a reasonable option if swimming matters more than maximum sunshine. The catch is a greater chance of interrupted outdoor plans, with 4 rainy days on average. November shifts further towards changeable weather: days average 18°C and rain occurs on 8 days. The sea retains some warmth, but cooler air and evenings make layers and flexible plans more useful.
A little more detail
Kefalos weather FAQs
Plain answers, grounded in the averages.
What is the best time to visit Kefalos?
Judged on warmth, low rainfall and sunshine, the best months in Kefalos are August, July and September. August is the hottest month (average high 26.5°C) and January the coolest (13.4°C).
How many months a year is Kefalos over 25°C?
2 months in Kefalos average a daytime high of 25°C or more, and 6 average 20°C or more.
When is the rainy season in Kefalos?
December is the wettest month in Kefalos (111 mm on average) and July the driest (0 mm). Annual rainfall averages 507 mm.
What is the hottest temperature recorded in Kefalos?
The hottest day recorded in Kefalos between 1991 and 2020 reached 34.0°C on 30 June 2017; the coldest fell to 1.1°C on 14 February 2004. Records come from daily data for 1991-2020, not from a single station's all-time history.
Is May or October better for swimming?
October is the better choice if water temperature matters most: the sea averages 23°C, compared with 19°C in May. May is drier and sunnier, however, so it suits travellers who prioritise time outdoors over warmer swimming water.
Can I expect warm winter weather in Kefalos?
Expect cool rather than warm holiday weather. Winter daytime averages range from 13°C to 15°C, and December, January and February each average 11 rainy days. Layers and waterproof clothing make more sense than packing mainly for the beach.
See also: Greece weather by month · where else is hot in August
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Kéfalos. Sea temperature from the nearest 5 km sea cell, 2.6 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C